Specola Astronomica Vaticana V

Abstract

THOUGH the subject of variable stars, apart from still earlier beginnings, has been actively studied for a century, and the realisation of its importance has been reflected in a growing volume of -technical literature, it has not hitherto received extended discussion on historical lines in a work exclusively devoted to this branch of astronomy. The first volume of such a work, for which Father Hagen assumed responsibility, has now been completed by the inclusion of a fourth and last part, on the elements of the light-change, the three earlier parts having been issued separately from the year 1913 onwards. The remaining second volume, which will deal with the physical explanations of the phenomena of variable stars, is in the hands of Father Stein, and its appearance will be anticipated with interest.

Specola Astronomica Vaticana V.

Herausgegeben von Johann Georg Hagen S.J. Johann Stein S.J. Die Veränderlichen Sterne. Erster Band: Geschichtlich-Technischer Teil. Von Johann Georg Hagen, S.J. Pp. xx + 811. (Freiburg im Breisgau and London: Herder und Co. G.m.b.H., 1921.) 42s.